Add /roll and friend management commands

Roll Command:
- Add /roll, /random, /rnd commands for random number generation
- Support multiple formats: /roll, /roll 100, /roll 1-100, /roll 10 50
- Broadcasts rolls to party/raid with "[Name] rolls X (min-max)" format
- Cap max roll at 10,000 to prevent abuse
- Use MSG_RANDOM_ROLL (0x1FB) bidirectional opcode

Friend Commands:
- Add /friend add <name>, /addfriend <name> to add friends
- Add /friend remove <name>, /removefriend <name> to remove friends
- Support aliases: /delfriend, /remfriend
- Maintain local friends cache mapping names to GUIDs for lookups
- Display status messages for all friend actions:
  - Friend added/removed confirmations
  - Friend online/offline notifications
  - Error messages (not found, already friends, list full, ignoring)

Social Opcodes:
- Add CMSG_ADD_FRIEND (0x69) and SMSG_FRIEND_STATUS (0x68)
- Add CMSG_DEL_FRIEND (0x6A) for friend removal
- Add CMSG_SET_CONTACT_NOTES (0x6B) for friend notes (future use)
- Add CMSG_ADD_IGNORE (0x6C) and CMSG_DEL_IGNORE (0x6D) (future use)

Implementation:
- Add RandomRollPacket builder and RandomRollParser for roll data
- Add AddFriendPacket and DelFriendPacket builders
- Add FriendStatusParser to handle server friend status updates
- Add friendsCache map to store friend name-to-GUID mappings
- Add handleRandomRoll() and handleFriendStatus() packet handlers
- Comprehensive slash command parsing with multiple formats and aliases

include/game/opcodes.hpp

@@ -63,6 +63,17 @@ enum class Opcode : uint16_t {
     CMSG_QUERY_TIME                  = 0x1CE,
     SMSG_QUERY_TIME_RESPONSE         = 0x1CF,
 
+    // ---- Social Commands ----
+    SMSG_FRIEND_STATUS               = 0x068,
+    CMSG_ADD_FRIEND                  = 0x069,
+    CMSG_DEL_FRIEND                  = 0x06A,
+    CMSG_SET_CONTACT_NOTES           = 0x06B,
+    CMSG_ADD_IGNORE                  = 0x06C,
+    CMSG_DEL_IGNORE                  = 0x06D,
+
+    // ---- Random Roll ----
+    MSG_RANDOM_ROLL                  = 0x1FB,
+
     // ---- Phase 1: Foundation (Targeting, Queries) ----
     CMSG_SET_SELECTION               = 0x13D,
     CMSG_NAME_QUERY                  = 0x050,